分布反馈激光二极管调制特性及线宽测量

Measurement of Modulation and Linewidth of DFB LD

本文介绍了利用光谱分析测量DFB LD调制特性的方法及装置。介绍了测量装置光路部分和电路部分的技术要点。对DFB LD的实测说明:注入DFB LD电流的变化不会引起注入载流子密度明显变化,进而不会由此引起光频率的变化。这种测量方法可方便而准确地测量使用DFB LD的光端机的直接光强调制深度。

In this paper, the method and the equipment measuring modulation characteristic of DFB LD with spectrographic analysis are described.The optical unit and the electronic unit of measurement equipment are shown. Measurement of DFB LD demonstrats clearly that variation of injection current of DFB LD hardly results in variation of density of injection carrier, then variation of optical wavelength resulted from carrier density does not take place. The depth of intensity modulation of optical transmitter using DFB LD may be also measured easily and accurately with the method.